Ahh, pilot season -- that time in a TV fan's year when we hear about planned new shows, fall in love with it, and then get anxious about whether we'll even see them on our screens. And yet we fall in love with them anyway.

Tonight's casting roundup kicks off with four pilot-y bits, and once that's done, we have a Big Love wife going to New York, a new head vampire in Bon Temps, and a purveyor of knowledge heading to Greendale. But yes, the pilot-y bits, yes.

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Sophia Bush's exit strategy after One Tree Hill wraps up is set: she is joining the CBS comedy pilot Brothers,according to Zap2it. The comedy, from Will and Grace creators David Kohan and Max Mutchnick, centers on two architects whose friendship borders on co-dependency -- at least until one of them proposes to his girlfriend (Bush), during which the other (who happens to be gay) grapples with the fact that he's been his friend's best relationship to date.

Katie Cassidy joins Stephen Arnell in the CW's Green Arrow pilot:TVLine reports that the Supernatural star will play Dinah Lance, a young attorney who shares a romantic past with Arnell's Oliver Queen. Cassidy's last appearance on the CW was a couple of years back, in a few episodes of Gossip Girl.

Kal Penn books the lead role in the ABC comedy pilot Prairie Dogs,Deadline reports. The former House star, who currently recurs on How I Met Your Mother, plays Neil, an uncool cubicle worker in one of the world's coolest companies who finds himself the victim of identity theft -- only for him to embrace the thief after finding out said criminal's lived a better life under his name.

Now, to the non-pilot-y bits: Chloe Sevigny books a role on Law & Order: SVU,according to TV Guide. The Big Love star will play a stay-at-home mom who is kidnapped while chatting with her husband, who's halfway around the world.

Andrew is headed back to Wisteria Lane: TV Guide also reports that Shawn Pyfrom is returning to Desperate Housewives. He'll appear on this season's 18th episode (that should air around March) with an announcement that should shatter his mom Bree (Marcia Cross). Or something.

Allison Janney books a guest role in Showtime's The Big C: she plays a Hollywood producer who is interested in turning Cathy (Laura Linney) and Paul's (Oliver Platt) life story into a movie, according to The Hollywood Reporter. She joins a mighty roster of guest stars including Susan Sarandon and Victor Garber, but still no word on Paul's fate... although we should know when the show returns on April 8.

John Hodgman leads the Four Horsemen of Greendale. Okay, so that wasn't as witty as what Dan Harmon could come up, but anyway: Hodgman will appear in an episode of Community, also according to THR. The comedian, who you've probably seen on The Daily Show (you're welcome) and, further back, as the PC in Apple's "I'm a Mac" ads, will appear towards the end of the third season.

Also appearing on the still-benched comedy, according to TVLine: Michael Ironside will play an Army general in the show's Law & Order send-off; Travis Schuldt (aka Scrubs' Keith Dudemeister) will play someone who had a romantic involvement with Britta (Gillian Jacobs); and Kirk Fox (aka Parks and Rec's Sewage Joe) will play a carnival performer who attracts the attention of... Britta. Oh, Britta. Can't you see Troy's over there pining for you? Or something?

Finally, a couple of True Blood items: Spartacus' Peter Mensah is headed to the HBO series as Kibwe, the Chancellor of the Vampire Authority who's looking to make vampires mainstream, according to Deadline.

Also, True Blood's Jessica Tuck is headed to NBC's Grimm as Catherine, the mother of mysterious Hexenbeist Adalind (Claire Coffee), according to EW. Tuck, whose character, the anti-Authority Nan Flanagan, was killed off at the end of season 4, recently appeared on ABC's Castle. Fangs off, kids.